Pump casing and magnet pump including the same

ABSTRACT

A pump casing defines an inner space including an inlet into which a fluid is introduced, a flow path through which the fluid is introduced from the inlet and discharged to the outside, and an arrangement space in which an impeller rotated about a predetermined central axis is disposed so as to guide flow of the fluid. The pump casing includes a suction casing which forms the inlet, a volute casing which forms the flow path, and the introduced fluid is discharged to the outside by the impeller. The volute casing forms the arrangement space in which the impeller is disposed, and the pump casing further includes a fluid guide device which is disposed in the inner space to guide movement of the fluid which is moved from the inlet toward the arrangement space.

BACKGROUND 1. Field of the Invention

The present invention relates to a pump casing and a magnet pump including the same, and more particularly, to a pump casing, which includes a suction casing which forms an inlet space into which a fluid is introduced and a volute casing which forms a flow path through which the fluid is introduced from the inlet space and the introduced fluid is discharged to the outside by an impeller, and a magnet pump including the same.

2. Discussion of Related Art

A conventional magnet pump known in the art includes a front casing which forms a pump chamber and a rear casing which forms a cylindrical space continued from the pump chamber.

A magnet can rotatably supported by a support shaft is disposed in the cylindrical space of the rear casing and an impeller accommodated inside the pump chamber is coupled to the magnet can.

A rotation driving unit magnetically coupled to the magnet can is disposed on an outer side of the rear casing, and the magnet can is formed to be rotated by a driving force of the rotation driving unit.

When the magnet can is rotated, the impeller coupled thereto is rotated, a transfer fluid is introduced into the pump chamber from a cylindrical inlet formed on a front surface of the front casing, and the transfer fluid is discharged from an outlet formed on a side surface of the front casing.

The support shaft extends to the inlet of the front casing through the pump chamber.

A front end portion of the support shaft is covered by a shaft support unit connected to the inlet and an inner wall of the inlet is connected to the shaft support unit by a plurality of supporting legs.

In Korean Patent Application Publication No. 10-2016-0122707 (Published on Oct. 24, 2016), a magnet pump is disclosed.

Here, a front casing may be divided into a portion forming an inlet 4 into which a fluid is introduced and a portion forming a pump chamber 3 which is a space in which an impeller 13 is disposed.

Depending on the purpose of use of the magnet pump, a size of a space defined by the inlet 4 and a size of a space which defines the pump chamber 3 need to be different.

However, in such a magnet pump, the portion forming the inlet 4 is integrally formed with the portion forming the pump chamber 3, and thus there is a problem in that many front casings should be manufactured depending on the purpose of use.

SUMMARY OF THE INVENTION

The present invention is directed to providing a pump casing, which includes a front casing which is manufactured by being divided into a suction casing which forms an inlet space into which a fluid is introduced and a volute casing which forms a flow path through which the fluid is introduced from the inlet space and the introduced fluid is discharged to the outside by an impeller, wherein the pump casing may be used by combining and fastening various types of suction casings and volute casings according to the use of the magnet pump, and providing a magnet pump including the same.

Objects of the present invention are not limited to the above-described objects, and other unmentioned objects may be clearly understood by those skilled in the art from this specification and the accompanying drawings.

According to an aspect of the present invention, there is provided a pump casing, which forms an inner space including an inlet space into which a fluid is introduced, a flow path through which the fluid is introduced from the inlet space and the introduced fluid is discharged to the outside, and an arrangement space in which an impeller rotated about a predetermined central axis is disposed so as to guide a flow of the fluid. The pump casing includes a suction casing which forms the inlet space into which the fluid is introduced, and a volute casing which forms the flow path through which the fluid is introduced from the inlet space and the introduced fluid is discharged to the outside by the impeller. The volute casing forms the arrangement space in which the impeller is disposed, and the pump casing further includes a fluid guide device which is disposed in the inner space to guide movement of the fluid which is moved from the inlet space toward the arrangement space.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing exemplary embodiments thereof in detail with reference to the accompanying drawings, in which:

FIG. 1 is a schematic cross-sectional view of a pump casing according to an embodiment of the present invention;

FIG. 2 is a schematic exploded cross-sectional view of the pump casing according to the embodiment of the present invention;

FIG. 3 is a schematic enlarged cross-sectional view of a portion of the pump casing according to the embodiment of the present invention in which a gap maintaining unit is omitted;

FIG. 4 is a schematic enlarged cross-sectional view of a portion of the pump casing according to the embodiment of the present invention in which the gap maintaining unit is included;

FIG. 5 illustrates schematic perspective views of a support unit of the pump casing according to the embodiment of the present invention;

FIG. 6 is a partial cross-sectional view of a magnet pump for describing a fluid guide device according to another embodiment of the present invention;

FIG. 7 is a partial exploded cross-sectional view of the magnet pump for describing the fluid guide device according to another embodiment of the present invention;

FIG. 8 illustrates front and rear perspective views of the fluid guide device according to another embodiment of the present invention;

FIG. 9 is an elevation view of the fluid guide device according to another embodiment of the present invention when viewed from the rear;

FIG. 10 is a cross-sectional view of the fluid guide device according to another embodiment of the present invention;

FIG. 11 is a partial enlarged cross-sectional view for describing a contact recessed portion of the fluid guide device according to another embodiment of the present invention; and

FIG. 12 is a partial enlarged cross-sectional view for describing a first insertion groove and a second insertion groove of the fluid guide device according to another embodiment of the present invention.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the spirit of the present invention is not limited to the embodiments presented in this specification. Those skilled in the art who understand the spirit of the present invention may easily suggest other embodiments that fall within the scope of the present invention or other regressive inventions by adding, changing, or deleting other elements within the scope of the same concept, and the other embodiments are also within the spirit of the present invention.

Elements having the same functions within the spirit of the same idea illustrated in the drawings of the embodiments will be described using the same reference numerals.

In the accompanying drawings, in order to more clearly express the technical spirit of the preset invention, portions that are not related to the technical spirit of the preset invention or that can be easily derived by those skilled in the art will be simplified or omitted.

First, a pump casing 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.

As illustrated in FIGS. 1 to 5, the pump casing 10 according to the embodiment of the present invention may refer to one component of a pump for implementing a flow of a fluid.

For example, the pump casing 10 may be a component forming a flow path through which a fluid flows.

For example, the pump casing 10 may include a suction casing 100, which forms an inlet space S1 into which a fluid is introduced, and a volute casing 200 which forms a flow path through which the fluid is introduced from the inlet space S1 and the introduced fluid is discharged to the outside by an impeller.

For example, the suction casing 100 and the volute casing 200 may be made of a metal material.

For example, the suction casing 100 may be a component forming the inlet space S1 so that the fluid may be introduced into the inlet space S1 from the outside by the impeller.

For example, the suction casing 100 may be connected to a conduit and/or a pipe (not illustrated) to receive a fluid from the conduit and/or the pipe.

For example, the volute casing 200 may be a component allowing the fluid to be introduced from the inlet space S1 by the impeller.

For example, the volute casing 200 may form the flow path through which the fluid received from the inlet space S1 is transmitted to the outside.

For example, the volute casing 200 may be connected to a conduit and/or a pipe to transmit a fluid to the conduit and/or the pipe.

Here, for example, the volute casing 200 may form an arrangement space S2 in which the impeller is disposed.

That is, the impeller may be disposed in the arrangement space S2 to generate rotational force and the fluid may be moved by the rotational force.

That is, the fluid may flow into the inlet space S1 formed by the suction casing 100 from the outside by the impeller and may be discharged to the outside from the inlet space S1 through the arrangement space S2 along the flow path formed by the volute casing 200.

Here, for example, the suction casing 100 may be attached to or detached from the volute casing 200 by predetermined detachable members T.

That is, the suction casing 100 may be connected to or separated from the volute casing 200 by the detachable members T.

The pump casing 10 may require the inlet space S1 and/or the arrangement space S2 which have various sizes and/or shapes depending on the purpose of use.

Therefore, the suction casing 100 and the volute casing 200 are not integrally formed but are formed to be detachable from each other, and thus the pump casing 10 has an advantage that the suction casing 100 and the volute casing 200 which have various sizes and/or shapes may be formed in combination with each other.

For example, the detachable member T may be a bolt or the like with screw threads formed thereon, but the present invention is not limited thereto. Any configuration as long as the suction casing 100 and the volute casing 200 can be selectively connected to or separated from each other may be variously modified by those skilled in the art.

However, hereinafter, for convenience of description, the detachable member T will be described on the assumption that the bolt is formed with screw threads. Here, for example, the suction casing 100 may include a suction main body 110 which forms the inlet space S1 and a first fastening unit 120 to which the detachable member T is fastened.

For example, the first fastening unit 120 may be provided with a plurality of first fastening units 120 at predetermined positions of the suction main body 110, and the detachable members T may be fastened to the first fastening units 120.

For example, the first fastening unit 120 may be formed to have screw threads corresponding to the screw threads of the detachable member T.

Here, for example, the volute casing 200 may include a volute main body 210 which forms the arrangement space S2 and a second fastening unit 220 to which the detachable member T is fastened.

For example, the second fastening unit 220 may be provided with a plurality of second fastening units 220 at positions corresponding to the positions of the first fastening units 120 on the volute main body 210.

For example, the second fastening unit 220 may be formed to have screw threads corresponding to the screw threads of the detachable member T.

As a result, when the detachable members T are fastened to the first fastening units 120 and, at the same time, fastened to the second fastening units 220, a connection between the suction casing 100 and the volute casing 200 may be implemented.

Here, for example, when the suction casing 100 is connected to the volute casing 200 by the detachable members T, the suction casing 100 may include a first facing surface 130 that faces the volute casing 200.

Further, when the volute casing 200 is connected to the suction casing 100 by the detachable members T, the volute casing 200 may include a second facing surface 230 that faces the first facing surface 130.

For example, the first facing surface 130 may refer to a surface that faces the volute casing 200 and the second facing surface 230 may refer to a surface that faces the suction casing 100.

That is, the first facing surface 130 and the second facing surface 230 may refer to surfaces facing each other due to the connection between the suction casing 100 and the volute casing 200.

Therefore, when the suction casing 100 and the volute casing 200 are not firmly connected, the fluid in the inlet space S1 and/or the arrangement space S2 may leak to the outside through a gap between the first facing surface 130 and the second facing surface 230.

For example, the first facing surface 130 and the second facing surface 230 may be formed radially inward from the first fastening unit 120 and the second fastening unit 220, respectively, with respect to a virtual central axis of the inlet space S1 and/or the arrangement space S2.

Here, for example, the pump casing 10 may further include a gap maintaining unit 300 disposed between the first facing surface 130 and the second facing surface 230 to prevent the fluid from leaking between the first facing surface 130 and the second facing surface 230.

For example, when the gap maintaining unit 300 is disposed between the first facing surface 130 and the second facing surface 230 so that the suction casing 100 is connected to the volute casing 200 by the detachable members T, the gap maintaining unit 300 may be pressurized by the first facing surface 130 and the second facing surface 230.

Therefore, the gap maintaining unit 300 may prevent the fluid from leaking between the first facing surface 130 and the second facing surface 230 by minimizing a distance between the first facing surface 130 and the second facing surface 230, i.e., by sealing the first facing surface 130 and the second facing surface 230.

More specifically, as illustrated in FIG. 3, when there is no gap maintaining unit 300 between the first facing surface 130 and the second facing surface 230, there may be a risk of leakage of the fluid in the inlet space S1 and/or the arrangement space S2 to the outside through the gap between the first facing surface 130 and the second facing surface 230.

In order to prevent the leakage of the fluid, as illustrated in FIG. 4, the gap maintaining unit 300 may be disposed between the first facing surface 130 and the second facing surface 230 to minimize the leakage of the fluid.

For example, the gap maintaining unit 300 may be made of a fluorine resin based elastic material such as perfluoroalkoxy alkane (PFA), polytetrafluoroethylene (PTFE), fluorinated ethylene propylene (FEP), ethylene tetrafluoroethylene (ETFE), ethylene FEP (EFEP), camptothecin (CPT), and/or the like.

As a result, a sealing function of the gap maintaining unit 300 may be further maximized.

Here, for example, when the suction casing 100 and the volute casing 200 are connected by the detachable members T, the gap maintaining unit 300 may form a separation space S3 between the first fastening unit 120 and the second fastening unit 220 so that the first fastening unit 120 and the second fastening unit 220 are not in contact with each other.

More specifically, even when the first fastening unit 120 and the second fastening unit 220 are completely fastened to the detachable members T, that is, even when the suction casing 100 and the volute casing 200 are firmly connected, the first fastening unit 120 and the second fastening unit 220 may not be in contact with each other by the gap maintaining unit 300.

That is, the first fastening unit 120 and the second fastening unit 220 may be spaced apart from each other by the gap maintaining unit 300. As a result, the separation space S3 may be formed between the first fastening unit 120 and the second fastening unit 220.

Generally, positions at which the fluid leaks from the inlet space S1 and/or the arrangement space S2 are very likely to be between the first fastening unit 120 and the second fastening unit 220. Therefore, even when the suction casing 100 and the volute casing 200 are firmly connected by the detachable members T, the gap maintaining unit 300 may form the separation space S3 so that the first fastening unit 120 and the second fastening unit 220 are not in contact with each other, and thus an operator may easily check leakage of the fluid by installing a detection device (not illustrated) that can detect the leakage of the fluid in the separation space S3.

Furthermore, when the operator detects the leakage of the fluid, the operator may easily visually determine whether the fluid leaks in the separation space S3 and may cope rapidly.

Therefore, the gap maintaining unit 300 may form the intended separation space S3 even when the gap maintaining unit 300 is deformed to an elastic limit by pressurization of the first facing surface 130 and the second facing surface 230, and thus the operator may rapidly check the fluid leaking between the first facing surface 130 and the second facing surface 230.

Here, for example, the gap maintaining unit 300 may be exposed to the separation space S3.

For example, one end of the gap maintaining unit 300 may be exposed to the separation space S3 and the operator may easily determine whether the gap maintaining unit 300 is damaged due to the separation space S3, whether the gap maintaining unit 300 is disposed at an intended position, and/or whether the fluid leaks through the gap maintaining unit 300.

Here, for example, the gap maintaining unit 300 may include a first gap maintaining unit 310 connected to the suction casing 100 and a second gap maintaining unit 320 connected to the volute casing 200.

That is, the gap maintaining unit 300 may not be formed with a single elastic body but may be formed by a combination of the first gap maintaining unit 310 and the second gap maintaining unit 320.

For example, the first gap maintaining unit 310 may be connected to the suction casing 100 so as to cover at least a portion of the first facing surface 130 of the suction casing 100.

For example, the second gap maintaining unit 320 may be connected to the volute casing 200 so as to cover at least a portion of the second facing surface 230 of the volute casing 200.

In the case in which the gap maintaining unit 300 is formed with a single elastic body and is connected to any one of the suction casing 100 and the volute casing 200, when the suction casing 100 and the volute casing 200 are connected to each other between the first facing surface 130 and the second facing surface 230 by the detachable member T, the gap maintaining unit 300 may not be disposed at an intended position between the first facing surface 130 and the second facing surface 230 due to unintentional pressurization from the suction casing 100 or the volute casing 200, and the position thereof may be changed.

Therefore, the gap maintaining unit 300 may be composed of the first gap maintaining unit 310 connected to the suction casing 100 in advance and the second gap maintaining unit 320 connected to the volute casing 200 in advance. As a result, even when the suction casing 100 and the volute casing are connected to each other by the detachable members T, the positions of the first gap maintaining unit 310 and the second gap maintaining unit 320 may not be changed and the gap maintaining unit 300 may be disposed at the intended position between the first facing surface 130 and the second facing surface 230.

Here, for example, the pump casing 10 may further include a support unit 400 which is disposed in the arrangement space S2 and supports a front end portion of a support shaft (not illustrated) for supporting the impeller.

For example, the support shaft may be a member for supporting the impeller.

For example, the impeller may be supported by the support shaft and rotated about the support shaft.

Here, for example, the front end portion of the support shaft may pass through the impeller to be supported by the support unit 400.

For example, the support unit 400 may include a support main body 410 which forms an accommodating space S4 for accommodating the front end portion of the support shaft, a vortex reduction unit 420 which is formed to protrude from the support main body 410 to reduce a vortex of the fluid that moves from the inlet space S1 to the arrangement space S2, and a support extending portion 430, which is formed to be spaced apart from the vortex reduction unit 420 to form a space in which the fluid flows and is supported by the suction casing 100 and/or the volute casing 200 so that the support main body 410 is disposed at a predetermined position in the arrangement space S2.

For example, the support shaft may be disposed in the accommodating space S4 to transmit a load of the impeller to the support main body 410.

For example, the support main body 410 may receive the load of the impeller to transmit the load of the impeller to the support extending portion 430, and the support extending portion 430 may transmit the load of the impeller to the suction casing 100 or the volute casing 200.

For example, the support unit 400 may be disposed in the arrangement space S2, and when the suction casing 100 is separated from the volute casing 200, the support unit 400 may be separated from the arrangement space S2.

Here, for example, the first facing surface 130 may press the support unit 400 in an axial direction so that the support unit 400 does not shake in the arrangement space S2.

More specifically, the suction casing 100 may be moved toward the volute casing 200 by the fastening of the detachable members T. As a result, the first facing surface 130 may be moved toward the volute casing 200 by the fastening of the detachable members T.

Therefore, the first facing surface 130 may press the support extending portion 430 of the support unit 400 disposed in the arrangement space S2 in the axial direction.

Here, for example, the first gap maintaining unit 310 may press the support unit 400 in the axial direction so that the support unit 400 does not shake in the arrangement space S2.

More specifically, the first gap maintaining unit 310 may be disposed between the first facing surface 130 and the support unit 400, and the suction casing 100 may be moved toward the volute casing 200 by the fastening of the detachable member T. As a result, the first gap maintaining unit 310 may be moved toward the volute casing 200 by the pressurization of the first facing surface 130.

In this case, the first gap maintaining unit 310 may press the support extending portion 430 of the support unit 400 toward the volute casing 200.

As a result, the support unit 400 may be pressurized by the support shaft and the first gap maintaining unit 310 to be fixed at a predetermined position in the arrangement space S2.

In this case, since the first gap maintaining unit 310 is made with an elastic material, the support extending portion 430 of the support unit 400, which is pressurized by the first gap maintaining unit 310, may be fixed at the predetermined position in the arrangement space S2 without being damaged.

For example, the axial direction may refer to a horizontal direction in FIG. 1.

Here, for example, the second gap maintaining unit 320 may press the support unit 400 in a direction orthogonal to the axial direction so that the support unit 400 does not shake in the arrangement space S2.

More specifically, the second gap maintaining unit 320 may be disposed between the volute main body 210 and the support unit 400, the support unit 400 may be forcibly fitted into the second gap maintaining unit 320, and the second gap maintaining unit 320 may generate an elastic force to pressurize the support unit 400 in the orthogonal direction.

Further, when the impeller is rotated in the axial direction as a rotational axis, the support unit 400 may receive a centrifugal force from the support shaft in a radially outward direction with respect to the rotational axis, and the support extending portion 430 of the support unit 400 may press the second gap maintaining unit 320 in the orthogonal direction due to the centrifugal force.

That is, the second gap maintaining unit 320 may be relatively pressurized by the support extending portion 430 of the support unit 400 due to the centrifugal force of the support unit 400.

As a result, the centrifugal force may be applied between the second gap maintaining unit 320 and the volute main body 210 and thus a sealing effect may be maximized.

For example, the first gap maintaining unit 310 may include a first separation contact unit 311 in contact with the second gap maintaining unit 320, a first support contact unit 313 in contact with the support unit 400, and a first extending portion 315 which extends from the first support contact unit 313 to the inlet space S1 and is not in contact with the support unit 400.

For example, the first separation contact unit 311 may be in contact with the second gap maintaining unit 320 to seal between the second gap maintaining unit 320 and the first gap maintaining unit 310.

For example, the first support contact unit 313 may press the support extending portion 430 of the support unit 400 to seal between the first gap maintaining unit 310 and the suction main body 110.

Further, the first extending portion 315 may extend from the first support contact unit 313 to prevent damage of an end portion of the first support contact unit 313 that may occur as the first support contact unit 313 presses the support unit 400.

Further, the first extending portion 315 may guide the first separation contact unit 311 and the first support contact unit 313 to be disposed at predetermined positions of the suction casing 100.

Further, for example, the second gap maintaining unit 320 may include a second separation contact unit 321 in contact with the first gap maintaining unit 310, a second support contact unit 323 in contact with the support unit 400, and a second extending portion 325 which extends from the second support contact unit 323 to the arrangement space S2 and is not in contact with the support unit 400.

For example, the second separation contact unit 321 may be in contact with the first gap maintaining unit 310 to seal between the first gap maintaining unit 310 and the second gap maintaining unit 320.

For example, the second support contact unit 323 may press the support extending portion 430 of the support unit 400 to seal between the second gap maintaining unit 320 and the suction main body 110.

Further, the second extending portion 325 may extend from the second support contact unit 323 to prevent damage of an end portion of the second support contact unit 323 that may occur as the second support contact unit 323 presses the support unit 400.

Further, the second extending portion 325 may guide the second separation contact unit 321 and the second support contact unit 323 to be disposed on predetermined positions of the volute casing 200.

Hereinafter, a fluid guide device 3000, which is another example of the present invention, will be described with reference to FIGS. 6 to 12.

The fluid guide device 3000 may have a configuration corresponding to that of the support unit 400.

In describing the technical idea of the fluid guide device 3000, elements overlapping the elements of the pump casing 10 described above with reference to FIGS. 1 to 5 will be omitted or briefly described.

As illustrated in FIGS. 6 and 7, the fluid guide device 3000 according to another embodiment of the present invention may refer to one component of a magnet pump A10 for implementing a flow of a fluid.

For example, a pump casing may form a flow path through which a fluid flows and may be a component forming a space in which components constituting the magnet pump A10 are disposed.

For example, the pump casing may form an inner space including an inlet space S1 into which a fluid is introduced, a flow path through which the fluid is introduced from the inlet space S1 and the introduced fluid is discharged to the outside, and an arrangement space S2 in which an impeller 4000 rotated about a predetermined central axis is disposed so as to guide a flow of the fluid.

That is, the inner space may refer to a space formed inside the pump casing so that the pump casing is distinguished from the outside and may be a concept including the inlet space S1 through which the fluid is introduced from the outside, the arrangement space S2 in which the impeller 4000 is disposed, and the flow path, which is a space in which the fluid is moved from the inlet space S1 to the outside through the arrangement space S2 by the rotation of the impeller 4000.

For example, the predetermined central axis may refer to a central axis of a support shaft X which will be described below.

For example, the pump casing may include a suction casing 1000, which forms the inlet space S1 into which the fluid is introduced, and the volute casing 2000 which forms the flow path through which the fluid is introduced from the inlet space S1 and the introduced fluid is discharged to the outside by the impeller 4000.

For example, the suction casing 1000 and the volute casing 2000 may be made of a metal material.

For example, the suction casing 1000 may be a component forming the inlet space S1 so that the fluid may be introduced into the inlet space S1 from the outside by the impeller 4000.

For example, the suction casing 1000 may be connected to a conduit and/or a pipe (not illustrated) to receive the fluid from the conduit and/or the pipe.

For example, the volute casing 2000 may be a component allowing the fluid to be introduced from the inlet space S1 by the impeller 4000.

For example, the volute casing 2000 may form the flow path through which the fluid received from the inlet space S1 is transmitted to the outside.

For example, the volute casing 2000 may be connected to a conduit and/or a pipe to transmit a fluid to the conduit and/or the pipe.

Here, for example, the volute casing 2000 may form the arrangement space S2 in which the impeller 4000 is disposed.

That is, the impeller 4000 may be disposed in the arrangement space S2 to generate rotational force and the fluid may be moved by the rotational force.

That is, the fluid may flow into the inlet space S1 formed by the suction casing 1000 from the outside by the impeller 4000 and may be discharged to the outside from the inlet space S1 through the arrangement space S2 along the flow path formed by the volute casing 2000.

Here, for example, the suction casing 1000 may be attached to or detached from the volute casing 2000 by predetermined detachable members T.

That is, the suction casing 1000 may be connected to or separated from the volute casing 2000 by the detachable members T.

Since the suction casing 1000 and the volute casing 2000 may correspond to the suction casing 100 and the volute casing 200 described with reference to FIGS. 1 to 5, respectively, detailed descriptions thereof will be omitted.

Meanwhile, the pump casing has been described above as being formed by combining the suction casing 1000 and the volute casing 2000 by the detachable members T, but the present invention is not limited thereto, and the pump casing may be defined by the suction casing 1000 and the volute casing 2000 which are integrally formed.

Here, for example, as illustrated in FIGS. 6 to 12, the fluid guide device 3000 may be formed to be disposed in the inner space to guide the movement of the fluid which moves from the inlet space S1 toward the arrangement space S2.

For example, the fluid guide device 3000 may guide the fluid to reduce a vortex of the fluid which moves from the inlet space S1 toward the arrangement space S2.

For example, the fluid guide device 3000 may include a guide main body 3100 which forms a moving space S5 in which the fluid moves from the inlet space S1 to the arrangement space S2, and a guide extending portion 3200 which extends inward from the guide main body 3100 to reduce the vortex of the fluid.

For example, the guide main body 3100 may have a cylindrical shape having a hollow and a region corresponding to the hollow may refer to the moving space S5.

For example, the guide extending portion 3200 may be formed to extend inward from the guide main body 3100, that is, extend in a direction toward the predetermined central axis.

For example, the guide extending portion 3200 may be provided with a plurality of guide extending portions 3200 that are spaced apart from each other on the guide main body 3100.

In this case, the moving space S5 may be formed between the plurality of guide extending portions 3200.

Here, for example, the fluid guide device 3000 may further include a guide support unit 3400 which extends from the guide extending portion 3200 and forms an accommodating space S4 for accommodating a front end portion of a support shaft X supporting the impeller 4000.

For example, the guide support unit 3400 may support the front end portion of the support shaft X, that is, a front side end of the support shaft X.

For example, a rear end of the support shaft X, that is, a rear side end (not illustrated) of the support shaft X, may be directly or indirectly supported by the pump casing.

For example, the front end portion of the support shaft X may be inserted into the accommodating space S4 and supported by the guide support unit 3400.

Here, for example, the fluid guide device 3000 may further include a guide contact unit 3300 which is in contact with the impeller 4000 rotated by an external force in the arrangement space S2.

The impeller 4000 may be rotated by the external force on the support shaft X in clockwise and/or counterclockwise, and the fluid may be moved from the inlet space S1 toward the arrangement space S2, that is, toward a rear side, by the rotation of the impeller 4000.

In this case, a force by which the impeller 4000 is moved in a direction from the arrangement space S2 toward the inlet space S1, that is, toward a front side, which is a direction opposite to the movement direction of the fluid in response to the movement of the fluid, may be applied to the impeller 4000.

In this case, the guide contact unit 3300 may be brought into contact with the impeller 4000 which is rotated at the same time as being moved forward, thereby reducing a frictional force with the impeller 4000 to maximize rotational efficiency of the impeller 4000.

To this end, for example, the guide contact unit 3300 may be made of a material having a small friction coefficient.

Here, a front side of the guide main body 3100 may be brought into contact with suction casing 1000, the guide main body 3100 may be brought into contact with the volute casing 2000 in a radial direction with respect to the predetermined central axis, and a rear side of the guide main body 3100 may be restrained to the support shaft X by the guide support unit 3400 so that a position of the guide main body 3100 is not moved by the suction casing 1000, the volute casing 2000, and the support shaft X.

Here, the guide main body 3100 may be formed of a material having a friction coefficient relatively greater than that of the guide contact unit 3300, and the movement of position of the guide main body 3100 in front-rear and/or radial directions may be limited even when an external force is applied while being restrained by the suction casing 1000, the volute casing 2000, and the support shaft X.

Here, the guide main body 3100 may be formed of a material having an elastic modulus relatively smaller than that of the guide contact unit 3300, and thus may have a relatively large amount of elastic change. As a result, the guide main body 3100 may disposed to be press-fitted into the suction casing 1000 and/or the volute casing 2000.

As a result, the guide contact unit 3300 may be formed of a material having a friction coefficient smaller than that of the guide main body 3100 and an elastic modulus greater than that of the guide main body 3100, and thus rotational efficiency of the impeller 4000 may be relatively greater than that of the guide main body 3100 (due to the friction coefficient). The guide contact unit 3300 may be brought into constant contact with the impeller 4000 at a predetermined position because elastic deformation due to the external force applied by the impeller 4000 is small (due to the elastic modulus).

On the other hand, the guide main body 3100 may be formed of a material having a friction coefficient greater than that of the guide contact unit 3300 and an elastic modulus smaller than that of the guide contact unit 3300, and thus the position movement of the guide main body 3100 in front-rear and/or radial directions may be limited even when the external force is applied while being restrained by the suction casing 1000, the volute casing 2000, and the support shaft X relatively greater than the guide contact unit 3300 (due to the friction coefficient). The guide main body 3100 may have a function of buffering external force due to large elastic deformation caused by the external force (due to the elastic modulus).

For example, the guide contact unit 3300 may be made of a carbon steel and/or ceramic material containing carbon such as sintered silicon carbide (SSiC), siliconized silicon carbide (SiSiC), or silicon carbide (SiC).

For example, the guide main body 3100 may be made of a fluorine resin material such as PFA, PTFE, FEP, ETFE, EFEP, CPT, and/or the like.

For example, the guide extending portion 3200 and the guide support unit 3400 may be made of the same material as the guide main body 3100.

For example, the fluid guide device 3000 may be manufactured by fixing an injection mold (not illustrated) to the guide contact unit 3300 having a predetermined shape, injecting a fluorine resin into the injection mold, and forming the guide main body 3100, the guide extending portion 3200, and the guide support unit 3400 to have a predetermined shape.

Hereinafter, a function of the fluid guide device 3000 will be described in more detail.

For example, the guide main body 3100 may surround at least a portion of the guide contact unit 3300.

As a result, the guide contact unit 3300 may be restrained by the guide main body 3100 and the position thereof may not be moved. Furthermore, the guide contact unit 3300 may transmit the external force received from the impeller 4000 to the guide main body 3100.

Further, for example, the guide contact unit 3300 may include a contact main body 3310 having a contact surface F in contact with the impeller 4000, and the contact surface F may be disposed to protrude more than the guide main body 3100 in a direction of the impeller 4000.

For example, at least a portion of the guide contact unit 3300 may be formed to protrude rearward more than the guide main body 3100. As a result, the contact surface F may be formed to protrude rearward more than the guide main body 3100.

Therefore, the impeller 4000 may not be in contact with the guide main body 3100 but may be in contact only with the contact surface F.

For example, the contact surface F may refer to a surface facing a rear side of the guide contact unit 3300, that is, a surface facing the impeller 4000.

Here, for example, the guide contact unit 3300 may further include a contact protrusion 3330 formed to protrude from the contact main body 3310, and the guide main body 3100 may surround the contact protrusion 3330.

For example, the contact protrusion 3330 may be formed to protrude radially from the contact main body 3310 with respect to the predetermined central axis.

That is, the contact protrusion 3330 may be formed to protrude radially outward from a radial outer surface of the contact main body 3310.

As a result, since the contact protrusion 3330 is restrained by the guide main body 3100, the position of the contact main body 3310 may be fixed to the guide main body 3100.

That is, since the contact protrusion 3330 is restrained by the guide main body 3100, the contact main body 3310 may be restricted from being moved forward and/or rearward with respect to the guide main body 3100.

Further, for example, the guide extending portion 3200 may surround at least a portion of the contact main body 3310.

More specifically, the guide main body 3100 may surround radial outer and front sides of the contact main body 3310 and the guide extending portion 3200 may surround a radial inner side of the contact main body 3310.

As a result, at least a portion of the contact main body 3310 may be surrounded by the guide main body 3100 and the guide extending portion 3200 and fixed at a predetermined position.

Further, for example, the contact main body 3310 may include a contact recessed portion C which is recessed from the contact surface F to form a recessed space.

For example, the contact recessed portion C may be formed to be recessed forward from the contact surface F.

For example, the contact recessed portion C may be formed on the contact surface F in a radial direction and may be provided with a plurality of contact recessed portions C on the contact surface F.

Since the contact recessed portions C are recessed forward from the contact surface F, the contact recessed portions C may not be in contact with the impeller 4000.

As a result, areas of the contact surfaces F in contact with the impeller 4000 may be reduced and the rotational efficiency of the impeller 4000 may be increased.

Further, since the fluid is introduced into the recessed space, heat generated by the contact of the impeller 4000 and the contact surface F may be dissipated, and, furthermore, a lubrication function may also be realized.

Here, for example, a maximum recessed depth L1 from the contact surface F to the contact recessed portion C may be smaller than a protruding height L2 from the guide main body 3100 to the contact surface F.

More specifically, as illustrated in FIG. 6, the contact surface F may be disposed to protrude rearward more than the guide main body 3100 and the contact recessed portion C may also be disposed to protrude rearward more than the guide main body 3100.

As a result, the maximum recessed depth L1 from the contact surface F to the contact recessed portion C in the forward direction may be formed to be smaller than the protruding height L2 from the guide main body 3100 to the contact surface F in the rearward direction.

In this case, the fluid introduced into the recessed space may pass through the recessed space to be moved radially outward and moved to a facing surface of the guide main body 3100 facing the impeller 4000.

That is, the fluid present in the recessed space may be moved toward the facing surface of the guide main body 3100 facing the impeller 4000, which has a relatively large space. As a result, the vortex of and/or stagnation of the fluid in the recessed space may be reduced, and at the same time, the heat dissipation function may be maximized.

Further, for example, as illustrated in FIGS. 9 and 12, the guide main body 3100 may form a first insertion groove B1 into which a fixing member (not illustrated) for fixing the pump casing and the guide main body 3100 is inserted on the pump casing so as not to be rotated about the predetermined central axis.

For example, the fixing member may be formed to protrude from an inner surface of a predetermined position of the pump casing so as to be inserted into the first insertion groove B1.

For example, the fixing member may be formed to protrude from an inner surface of a predetermined position of the volute casing 2000 so as to be inserted into the first insertion groove B1.

Further, for example, the fixing member may be a separate cylindrical anti-rotation key that is not integrally formed with the pump casing. In this case, the pump casing may form a groove so that a portion of the fixing member may be inserted thereinto.

In this case, the portion of the fixing member may be inserted into the groove of the pump casing and the other portion may be inserted into the first insertion groove B1. As a result, the fixing member may fix the guide main body 3100 so that the guide main body 3100 is not rotated about the predetermined central axis on the pump casing.

Further, for example, the contact main body 3310 may form a second insertion groove B2 into which the fixing member inserted into the first insertion groove B1 is inserted so that the contact main body 3310 is not rotated about the predetermined central axis on the guide main body 3100.

That is, the fixing member may be inserted into the first insertion groove B1 formed by the guide main body 3100 and, at the same time, inserted into the second insertion groove B2 formed by the contact main body 3310.

As a result, the contact main body 3310 may not be rotated about the predetermined central axis on the pump casing.

For example, the first insertion groove B1 and the second insertion groove B2 may be formed to have an identical curvature with respect to a virtual central axis.

For example, each of the first insertion groove B1 and the second insertion groove B2 may be formed by passing a portion of the guide main body 3100 and a portion of the contact main body 3310 therethrough in a direction of the virtual central axis and may be provided with a plurality of insertion grooves to be spaced apart from each other.

The magnet pump A10 according to another embodiment of the present invention may include the fluid guide device 3000, the pump casing, an outer magnet 6000 rotated by a motor, an inner magnet 5000 rotated by the outer magnet 6000, and the impeller 4000 rotated by the inner magnet 5000.

The outer magnet 6000 may be rotated about the predetermined central axis by the rotation of the motor, the inner magnet 5000 may be rotated on the support shaft X by the rotation of the outer magnet 6000, and the impeller 4000 may be rotated by being in communication with the inner magnet 5000.

In addition, an operation method of the impeller 4000 rotated by the outer magnet 6000 and the inner magnet 5000 in the inner space of the pump casing may be easily implemented by those skilled in the art as can be seen in Korean Unexamined Patent Application Publication No. 10-2016-0122707 (Published on Oct. 24, 2016) or the like, and thus is illustrated in the form of a box in FIG. 6. Furthermore, a detailed description thereof will be omitted.

The fluid guide device 3000 may be attached to or detached from the pump casing and disposed on the pump casing to guide a fluid.

Further, the fluid guide device 3000 described with reference to FIGS. 6 to 12 may be applied as one component of the pump casing 10 in place of the support unit 400 described with reference to FIGS. 1 to 5.

That is, it should be clear to those skilled in the art that the technical concept of the pump casing 10 described with reference to FIGS. 1 to 5 may be implemented by applying the fluid guide device 3000 in place of the support unit 400.

In the pump casing according to the embodiment of the present invention, a front casing can be manufactured by being divided into a suction casing which forms an inlet space into which a fluid is introduced and a volute casing which forms a flow path through which the fluid is introduced from the inlet space and the introduced fluid is discharged to the outside by an impeller, and thus the pump casing can be used by combining and fastening various types of suction casings and volute casings according to the use of the magnet pump.

Effects of the present invention are not limited to the above-described effect, and the other unmentioned effects will be clearly understood by those skilled in the art from this specification and the accompanying drawings.

Although the configuration and features of the present invention have been described with reference to the embodiments of the present invention, the present invention is not limited thereto. In addition, those skilled in the art may easily change and modify the embodiments within the spirit and scope of the present invention and it will be clear that such changes or modifications fall within the scope of the appended claims. 

1. A pump casing, which forms an inner space including an inlet space into which a fluid is introduced, a flow path through which the fluid is introduced from the inlet space and the introduced fluid is discharged to the outside, and an arrangement space in which an impeller rotated about a predetermined central axis is disposed so as to guide a flow of the fluid, the pump casing comprising: a suction casing which forms the inlet space into which the fluid is introduced; and a volute casing which forms the flow path through which the fluid is introduced from the inlet space and the introduced fluid is discharged to the outside by the impeller, wherein the volute casing forms the arrangement space in which the impeller is disposed, and the pump casing further includes a fluid guide device which is disposed in the inner space to guide movement of the fluid which is moved from the inlet space toward the arrangement space.
 2. The pump casing of claim 1, wherein the fluid guide device includes: a guide main body which forms a moving space in which the fluid is moved from the inlet space to the arrangement space; a guide extending portion which extends inward from the guide main body to reduce a vortex of the fluid being moved; and a guide contact unit in contact with the impeller rotated by an external force in the arrangement space, wherein the guide contact unit has a friction coefficient smaller than that of the guide main body and an elastic modulus greater than that of the guide main body.
 3. The pump casing of claim 2, wherein: the guide main body surrounds at least a portion of the guide contact unit; the guide contact unit includes a contact main body having a contact surface in contact with the impeller; and the contact surface is disposed to protrude more than the guide main body in a direction of the impeller.
 4. The pump casing of claim 3, wherein: the guide contact unit further includes a contact protrusion which protrudes radially from the contact main body with respect to the predetermined central axis; and the guide main body surrounds the contact protrusion.
 5. The pump casing of claim 3, further comprising a guide support unit which extends from the guide extending portion and forms an accommodating space for accommodating a front end portion of a support shaft supporting the impeller, wherein the guide extending portion surrounds at least a portion of the contact main body.
 6. The pump casing of claim 3, wherein the contact main body includes a contact recessed portion which is recessed from the contact surface to form a recessed space.
 7. The pump casing of claim 6, wherein a maximum recessed depth from the contact surface to the contact recessed portion is smaller than a protruding height from the guide main body to the contact surface.
 8. The pump casing of claim 3, wherein: the guide main body forms a first insertion groove into which a fixing member for fixing the pump casing and the guide main body is inserted so as not to be rotated about the predetermined central axis on the pump casing; and the contact main body forms a second insertion groove into which the fixing member inserted into the first insertion groove is inserted so as not to be rotated about the predetermined central axis on the guide main body.
 9. The pump casing of claim 1, wherein: the suction casing is detachable from the volute casing by a predetermined detachable member; the suction casing includes a suction main body forming the inlet space and a first fastening unit to which the detachable member is fastened; the volute casing includes a volute main body forming the arrangement space and a second fastening unit to which the detachable member is fastened; the suction casing includes a first facing surface facing the volute casing when the suction casing is connected to the volute casing by the detachable member; and the volute casing includes a second facing surface facing the first facing surface when the volute casing is connected to the suction casing by the detachable member.
 10. The pump casing of claim 9, further comprising a gap maintaining unit disposed between the first facing surface and the second facing surface so as to prevent the fluid from leaking between the first facing surface and the second facing surface, wherein the gap maintaining unit is made of an elastic material.
 11. The pump casing of claim 10, wherein, when the suction casing and the volute casing are connected by the detachable member, the gap maintaining unit forms a separation space between the first fastening unit and the second fastening unit so that the first fastening unit and the second fastening unit are not in contact with each other.
 12. The pump casing of claim 11, wherein the gap maintaining unit includes: a first gap maintaining unit connected to the suction casing; and a second gap maintaining unit connected to the volute casing, wherein the first gap maintaining unit presses the fluid guide device in an axial direction so that the fluid guide device does not shake in the inner space, and the second gap maintaining unit presses the fluid guide device in a direction orthogonal to the axial direction so that the fluid guide device does not shake in the inner space.
 13. The pump casing of claim 12, wherein: the first gap maintaining unit includes a first separation contact unit in contact with the second gap maintaining unit, a first support contact unit in contact with a support unit which forms an accommodating space for accommodating a front end portion of a support shaft supporting the impeller, and a first extending portion which extends from the first support contact unit to the inlet space and is not in contact with the support unit; and the second gap maintaining unit includes a second separation contact unit in contact with the first gap maintaining unit, a second support contact unit in contact with the support unit, and a second extending portion which extends from the second support contact unit to the arrangement space and is not in contact with the support unit.
 14. The pump casing of claim 9, wherein the first facing surface presses the fluid guide device so that the fluid guide device does not shake in the inner space.
 15. A magnet pump comprising: the pump casing according to claim 1; an outer magnet rotated by a motor; an inner magnet rotated by the outer magnet; and an impeller rotated by the inner magnet. 